By Neil J. Gunther
To unravel functionality difficulties in glossy computing infrastructures, frequently comprising hundreds of thousands of servers working 1000s of functions, spanning a number of stages, you wish instruments that transcend mere reporting. you wish instruments that allow functionality research of software workflow around the complete company. That's what PDQ (Pretty rattling quickly) offers. PDQ is an open-source functionality analyzer in response to the paradigm of queues. Queues are ubiquitous in each computing setting as buffers, and because any program structure will be represented as a circuit of queueing delays, PDQ is a average healthy for interpreting process functionality. construction at the good fortune of the 1st variation, this significantly extended moment version now includes 4 elements. half I comprises the foundational innovations, in addition to a brand new first bankruptcy that explains the significant position of queues in profitable functionality research. half II presents the fundamentals of queueing thought in a hugely intelligible type for the non-mathematician; little greater than high-school algebra being required. half III provides many useful examples of ways PDQ might be utilized. The PDQ guide has been relegated to an appendix partly IV, in addition to suggestions to the workouts contained in each one bankruptcy. all through, the Perl code listings were newly formatted to enhance clarity. The PDQ code and updates to the PDQ handbook can be found from the author's site at www.perfdynamics.com
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For more details. 1988 The author reads Courtois  and develops the Instanton method (borrowed from quantum mechanics) to solve the same transient performance problems as Randy Nelson and Alan Weiss. See Sect. , and Gunther [1989, 2000a] for further details. 1989 The author studies phase transition effects in queueing models of circuit-switched networks with dynamic routing [Gunther 1990]. Models, a queueing network solver for Unisys 2200 mainframes. 1992 While at Pyramid Technology, the author develops the proprietary queueing analyzer called ENQUIAR (ENterprise QUeueIng AnalyzeR).
Of course, if someone only works with systems that operate in these specialized regimes, he can be forgiven for being “Newtonian” and thinking that throughput and latency are completely independent performance metrics. 5 Stretch Factor Imagine you are in a grocery store where it will take time S for the cashier to ring up your groceries. When you arrive at the checkout, however, you first have to wait behind N people ahead of you. Each one them also takes time S (on average) to have their groceries rung up.
For example, some variants of the unix operating system have SAR (System Activity Reporter) [Peek et al. 1997]. Most unix variants have vmstat (see sample output in Figs. 13) while the Linux operating system has the procinfo command (Fig. 4). These tools display ASCII characters and the format can vary across different unix platforms. , Friedman and Pentakalos 2002]. A common limitation of most generic performance tools is that the metrics are not time-stamped. SAR is one exception among these older generic tools.